The sled is not gone. You can find it in the hovel next to the river, bugged with a corpse.And the lone deer is still there, looking somewhat stupid now.

Aya, some jackass decided to let himself get frozen in the sled and somebody decided to try to be helpful and get him out of the way after he kicked the bucket. I learned my lesson about moving seated bodies before, so it wasn't me that moved him this time.